John Renshaw Carson (June 28, 1886 – October 31, 1940) was an American transmission theorist for early communications systems. He invented single-sideband modulation and developed the Carson bandwidth rule for estimating frequency modulation (FM) bandwidth. In 2013 Carson was inducted into the Electronic Design Hall of Fame for his contributions to communications.[1]
The Carson twins, from the Princeton University Class of 1907 album. John Renshaw Carson is on the left.
John Renshaw Carson, 9th from left (often misidentified as Nikola Tesla), in a group of prominent scientists at a demonstration of RCA's trans-ocean communication at the New Brunswick Marconi Station, April 23, 1921. Albert Einstein is 8th from left, and Charles Steinmetz is at center, in light-colored suit.[2]
Carson was born in Pittsburgh, Pennsylvania, and together with his twin brother Joseph attended Princeton University, graduating in 1907 with a Bachelor of Science degree. John attended the Massachusetts Institute of Technology 1907–1908, before returning to Princeton to receive his electrical engineering degree in 1909 and a Master of Science degree in 1912. From 1912 to 1914 Carson was an instructor in Electrical Engineering and Physics at Princeton, but in 1913 was offered a position at American Telephone & Telegraph (AT&T), and in 1914 left the university.[3]
At AT&T, Carson was involved in early radio telephone experiments. In 1915 he invented[4]single-sideband modulation to transmit multiple telephone calls simultaneously on a single electrical circuit, and was responsible for installing the first such system between Pittsburgh and Baltimore. In 1922 he published a mathematical treatment of frequency modulation (FM), which introduced the Carson bandwidth rule. In his 1922 paper, Carson presented a negative opinion of narrowband FM, which occurs when the maximum frequency swing is made narrower than the audio bandwidth. Later, Edwin Armstrong managed to demonstrate that FM can be advantageous if the frequency swing is significantly wider than the audio bandwidth. From 1917 to 1925 Carson analyzed the effects of filters on amplitude modulation via operational calculus, thus allowing telephone system designers to predict crosstalk in multiple calls over a single pair of wires. He published a series of papers on this subject in the Bell System Technical Journal, culminating in his 1926 book Electrical Circuit Theory and Operational Calculus.
From 1925 to 1940 Carson worked for Bell Telephone Laboratories as a mathematician and electrical engineer. Notable work during this era included his mathematical analysis of George C. Southworth's 1932 waveguide experiments.
U.S. Patent 1,449,382 : John Carson/AT&T: "Method and Means for Signaling with High Frequency Waves" filed on December 1, 1915; granted on March 27, 1923
Selected works
1921: "Wave Propagation over Parallel Wires: The Proximity effect", Philosophical Magazine, volume IXLI, pages 607–633.
1922: "Notes on the Theory of Modulation", Proceedings of the Institute of Radio Engineers, volume 10, issue 1, pages 57–64.
Brittain, J.E., "John R. Carson and the conservation of radio spectrum", Proceedings of the IEEE, volume 84, issue 6, June 1996, pages 909–910.
Mario Lucertini, Ana Millán Gasca, F. Nicolò, Technological Concepts and Mathematical Models in the Evolution of Modern Engineering Systems, Birkhäuser, 2004, pages 114–117. ISBN3-7643-6940-X.
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John Renshaw Carson June 28 1886 October 31 1940 was an American transmission theorist for early communications systems He invented single sideband modulation and developed the Carson bandwidth rule for estimating frequency modulation FM bandwidth In 2013 Carson was inducted into the Electronic Design Hall of Fame for his contributions to communications 1 The Carson twins from the Princeton University Class of 1907 album John Renshaw Carson is on the left Contents 1 Biography 2 Patent 3 Selected works 4 See also 5 References 6 SourcesBiography Edit John Renshaw Carson 9th from left often misidentified as Nikola Tesla in a group of prominent scientists at a demonstration of RCA s trans ocean communication at the New Brunswick Marconi Station April 23 1921 Albert Einstein is 8th from left and Charles Steinmetz is at center in light colored suit 2 Carson was born in Pittsburgh Pennsylvania and together with his twin brother Joseph attended Princeton University graduating in 1907 with a Bachelor of Science degree John attended the Massachusetts Institute of Technology 1907 1908 before returning to Princeton to receive his electrical engineering degree in 1909 and a Master of Science degree in 1912 From 1912 to 1914 Carson was an instructor in Electrical Engineering and Physics at Princeton but in 1913 was offered a position at American Telephone amp Telegraph AT amp T and in 1914 left the university 3 At AT amp T Carson was involved in early radio telephone experiments In 1915 he invented 4 single sideband modulation to transmit multiple telephone calls simultaneously on a single electrical circuit and was responsible for installing the first such system between Pittsburgh and Baltimore In 1922 he published a mathematical treatment of frequency modulation FM which introduced the Carson bandwidth rule In his 1922 paper Carson presented a negative opinion of narrowband FM which occurs when the maximum frequency swing is made narrower than the audio bandwidth Later Edwin Armstrong managed to demonstrate that FM can be advantageous if the frequency swing is significantly wider than the audio bandwidth From 1917 to 1925 Carson analyzed the effects of filters on amplitude modulation via operational calculus thus allowing telephone system designers to predict crosstalk in multiple calls over a single pair of wires He published a series of papers on this subject in the Bell System Technical Journal culminating in his 1926 book Electrical Circuit Theory and Operational Calculus From 1925 to 1940 Carson worked for Bell Telephone Laboratories as a mathematician and electrical engineer Notable work during this era included his mathematical analysis of George C Southworth s 1932 waveguide experiments Carson received the 1924 IRE Morris N Liebmann Memorial Award in recognition of his valuable contributions to alternating current circuit theory and in particular to his investigations of filter systems and of single side band telephony He received an honorary Doctor of Science degree from Brooklyn Polytechnic Institute in 1937 and the 1939 Elliott Cresson Medal from the Franklin Institute His undergraduate letters are archived at Princeton University Patent EditU S Patent 1 449 382 John Carson AT amp T Method and Means for Signaling with High Frequency Waves filed on December 1 1915 granted on March 27 1923Selected works Edit1921 Wave Propagation over Parallel Wires The Proximity effect Philosophical Magazine volume IXLI pages 607 633 1922 Notes on the Theory of Modulation Proceedings of the Institute of Radio Engineers volume 10 issue 1 pages 57 64 1924 A Generalization of Reciprocal Theorem Bell System Technical Journal 3 393 399 1925 Selective Circuits and Static Interference Bell System Technical Journal 4 265 1926 Wave Propagation in Overhead Wires with Ground Return Bell System Technical Journal 5 539 1926 Electrical Circuit Theory and Operational Calculus New York McGraw Hill 1926 The Heaviside Operational Calculus Bulletin of the American Mathematical Society 32 1 43 68 link from Project Euclid 1936 with S P Mead and S A Schelkunoff Hyper Frequency Waveguides Mathematical Theory Bell System Technical Journal 15 310 333 See also EditLaplace Carson transformReferences Edit Frenzel Lou John Renshaw Carson Pioneer Ruled Modulation s Earliest Innovations Electronic Design Retrieved 9 November 2018 Einstein and Steinmetz with group New York Heritage Digital Collections Retrieved 9 November 2018 Frenzel Lou John Renshaw Carson Pioneer Ruled Modulation s Earliest Innovations Electronic Design Retrieved 9 November 2018 US 1449382 John Carson AT amp T Method and Means for Signaling with High Frequency Waves filed on December 1 1915 granted on March 27 1923Sources EditJohn amp Robb Carson Letters in Mudd Manuscript Library of Princeton University Library Archives Brittain J E John R Carson and the conservation of radio spectrum Proceedings of the IEEE volume 84 issue 6 June 1996 pages 909 910 Mario Lucertini Ana Millan Gasca F Nicolo Technological Concepts and Mathematical Models in the Evolution of Modern Engineering Systems Birkhauser 2004 pages 114 117 ISBN 3 7643 6940 X Julie K Petersen Fiber Optics Illustrated Dictionary CRC Press 2003 page 264 ISBN 0 8493 1349 X Retrieved from https en wikipedia org w index php title John Renshaw Carson amp oldid 1123037254, wikipedia, wiki, book, books, library,
